<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type='text/javascript' src='../js/vue.js'></script>
</head>
<body>
    <div id="root">
        姓：<input type='text' v-model='firstName'/><br/><br/>
        名：<input type='text' v-model='lastName'/><br/><br/>
        名字：<span>{{firstName.slice(0,5)}}-{{lastName}}</span>
        
    </div>
</body>
<script>
    new Vue({
        el:'#root',
        data:{
            firstName:'SONG',
            lastName:'YAXUAN'
        }
    })
</script>
</html>